1/D

2/B

3/B

4/B

5/B -> careful

6/ A -> go

7/ A -> put

Gọi hóa trị của Cu là: a

Theo quy tắc hóa tị ta có:

 1 . a = 2. I → a = II

Vậy hóa trị của Cu trong hợp chất Cu(HO)₂là II

I. Find the word with different sound in the underline part in each line.

II. Choose A, B, c or D that best completes the sentences or substitutes for the underlined word or phrase.

6.      My mother’s favourite hobby is______. She loves preparing food for my family.

A. sewing                 B. cooking     C. gardening               D. painting

7.    My grandmother loves______. She plants flowers and vegetables in the small garden behind her house.

A. listening      B. climbing     C. fishing                    D. gardening

8.       If you always buy flowers and put them in a vase, your hobby is______ .

A. bird-watching    B. gardening   C. arranging flowers   D. cooking

9.       My sister always gives me dolls on special occasions.

A. chances                B. dates                    C. position        D. Reasons

10.      My sister likes_______ because she can play in the water and keep fit.

A. collecting                B.shopping                  C. dancing       D. swimming

11. Can I ask you some questions______your hobbies?,

A. of                            B. about                      C. with            D. for

12. My father is fond ______football.

A. from                       B. at                            C. of                D. by

13. Tom is very good______playing the guitar.,

A. for                          B. at                            C. about          D. of

14. Mary is interested______reading comic books.,

A. in                            B. by                           C. on               D. from

15. There are some things I like doing______ my free time.

A. on                             B. at                         C. about                        D. in

Her school is on Nguyen Cao Thang street.

It has 5 floors 

She is in class 6A

She starts her classes at 2 o'clock in the afternoon

No, she doesn't

1 tấn 452 kg

1.I usually sleep 7 hours at night because sleep enough at night makes me feel good.

2.I often go to bed at 10:00p.m, but i stay up until 2:00 a.m to watch moivies with my cousin last summer vacation. Although it isn't good for my health, i enjoy staying up late 

3. No, i don't. Sometimes, i have a lot of homework, so i stay up to 12:00 p.m to finish them.

4. Yes, i do. If you get enough sleep, you will feel good and have a lot of energy to work tomorrow.

5. Yeah, I think older people should sleep more than children because i think older peaple have weaker health than children. They should sleep more than children for good health.

That's my answer. Thanks for reading my answer .

D